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Message-ID: <20181204062313.28942-1-xiaoning.wang@nxp.com>
Date: Tue, 4 Dec 2018 06:24:59 +0000
From: Clark Wang <xiaoning.wang@....com>
To: "broonie@...nel.org" <broonie@...nel.org>
CC: "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Clark Wang <xiaoning.wang@....com>
Subject: [PATCH] spi: lpspi: Add cs-gpio support
Add cs-gpio feature for LPSPI. Use fsl_lpspi_prepare_message() and
fsl_lpspi_unprepare_message() to enable and control cs line.
These two functions will be only called at the beginning and the ending
of a message transfer.
Still support using the mode without cs-gpio. It depends on if attribute
cs-gpio has been configured in dts file.
Signed-off-by: Clark Wang <xiaoning.wang@....com>
---
drivers/spi/spi-fsl-lpspi.c | 79 ++++++++++++++++++++++++++++++++++++-
1 file changed, 78 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index a7d01b79827b..c6fe3f94de19 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -9,6 +9,7 @@
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/err.h>
+#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
@@ -16,7 +17,9 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/platform_data/spi-imx.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
@@ -28,6 +31,10 @@
#define FSL_LPSPI_RPM_TIMEOUT 50 /* 50ms */
+#define LPSPI_CS_ACTIVE 1
+#define LPSPI_CS_INACTIVE 0
+#define LPSPI_CS_DELAY 100
+
/* i.MX7ULP LPSPI registers */
#define IMX7ULP_VERID 0x0
#define IMX7ULP_PARAM 0x4
@@ -104,6 +111,8 @@ struct fsl_lpspi_data {
struct completion xfer_done;
bool slave_aborted;
+
+ int chipselect[0];
};
static const struct of_device_id fsl_lpspi_dt_ids[] = {
@@ -176,6 +185,48 @@ static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller)
return 0;
}
+static void fsl_lpspi_chipselect(struct spi_device *spi, bool enable)
+{
+ struct fsl_lpspi_data *fsl_lpspi =
+ spi_controller_get_devdata(spi->controller);
+ int gpio = fsl_lpspi->chipselect[spi->chip_select];
+
+ enable = (!!(spi->mode & SPI_CS_HIGH) == enable);
+
+ if (!gpio_is_valid(gpio))
+ return;
+
+ gpio_set_value_cansleep(gpio, enable);
+}
+
+static int fsl_lpspi_prepare_message(struct spi_controller *controller,
+ struct spi_message *msg)
+{
+ struct fsl_lpspi_data *fsl_lpspi =
+ spi_controller_get_devdata(controller);
+ struct spi_device *spi = msg->spi;
+ int gpio = fsl_lpspi->chipselect[spi->chip_select];
+
+ if (gpio_is_valid(gpio)) {
+ gpio_direction_output(gpio,
+ fsl_lpspi->config.mode & SPI_CS_HIGH ? 0 : 1);
+ }
+
+ fsl_lpspi_chipselect(spi, LPSPI_CS_ACTIVE);
+
+ return 0;
+}
+
+static int fsl_lpspi_unprepare_message(struct spi_controller *controller,
+ struct spi_message *msg)
+{
+ struct spi_device *spi = msg->spi;
+
+ fsl_lpspi_chipselect(spi, LPSPI_CS_INACTIVE);
+
+ return 0;
+}
+
static void fsl_lpspi_write_tx_fifo(struct fsl_lpspi_data *fsl_lpspi)
{
u8 txfifo_cnt;
@@ -512,10 +563,13 @@ static int fsl_lpspi_init_rpm(struct fsl_lpspi_data *fsl_lpspi)
static int fsl_lpspi_probe(struct platform_device *pdev)
{
+ struct device_node *np = pdev->dev.of_node;
struct fsl_lpspi_data *fsl_lpspi;
struct spi_controller *controller;
+ struct spi_imx_master *lpspi_platform_info =
+ dev_get_platdata(&pdev->dev);
struct resource *res;
- int ret, irq;
+ int i, ret, irq;
u32 temp;
if (of_property_read_bool((&pdev->dev)->of_node, "spi-slave"))
@@ -539,6 +593,29 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
fsl_lpspi->is_slave = of_property_read_bool((&pdev->dev)->of_node,
"spi-slave");
+ if (!fsl_lpspi->is_slave) {
+ for (i = 0; i < controller->num_chipselect; i++) {
+ int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
+
+ if (!gpio_is_valid(cs_gpio) && lpspi_platform_info)
+ cs_gpio = lpspi_platform_info->chipselect[i];
+
+ fsl_lpspi->chipselect[i] = cs_gpio;
+ if (!gpio_is_valid(cs_gpio))
+ continue;
+
+ ret = devm_gpio_request(&pdev->dev,
+ fsl_lpspi->chipselect[i], DRIVER_NAME);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get cs gpios\n");
+ goto out_controller_put;
+ }
+ }
+
+ controller->prepare_message = fsl_lpspi_prepare_message;
+ controller->unprepare_message = fsl_lpspi_unprepare_message;
+ }
+
controller->transfer_one_message = fsl_lpspi_transfer_one_msg;
controller->prepare_transfer_hardware = lpspi_prepare_xfer_hardware;
controller->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware;
--
2.17.1
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